@VisualParadox It's not an issue, I have the physical disc version with all the updates. You're welcome to install the whole 605 odd GB off the net but it's the same thing and wont make any difference.

@neO_o_ Have you tried running with enb & reshade. I have not tried it on the current version of nvr but do recall reshade taxing the gpu more when I tried it on nvr some time back. Yeah the rage engine seems to be a bit cpu heavy at times.

@neO_o_ Correct, NVR contains no road textures. The vanilla ones are sharper and less fuzzy. no idea why it's highly rated. I no longer use it.

What CPU do you have?
What resolution you playing at?
GTA V is the only game I have where GPU usage fluctuates so much and it's a common thing if you look at youtube. You can try turning up gfx settings or playing at a higher resolution using dsr in nvidia control panel.